fix(api): read temperature from main if no per-core data is found

this is important for raspberry pi, because it has no lm-sensors

fix #107

Dockerfile

@@ -5,7 +5,18 @@ WORKDIR /app
 
 RUN \
   apk update &&\
-  apk add git make clang build-base lsblk dmidecode util-linux lm-sensors speedtest-cli &&\
+  apk add \
+    git \
+    make \
+    clang \
+    build-base \
+    lsblk \
+    dmidecode \
+    util-linux \
+    lm-sensors \
+    speedtest-cli &&\
+  apk add -f \
+    raspberrypi &&\
   git config --global --add safe.directory /app
 
 # DEV #

apps/api/src/dynamic-info.ts

@@ -48,16 +48,17 @@ export const cpuObs = createBufferedInterval(
     const loads = (await si.currentLoad()).cpus;
 
     let temps: si.Systeminformation.CpuTemperatureData['cores'] = [];
+    let mainTemp = 0;
     if (CONFIG.enable_cpu_temps) {
+      const siTemps = await si.cpuTemperature();
       const threadsPerCore = staticInfo.cpu.threads / staticInfo.cpu.cores;
-      temps = (await si.cpuTemperature()).cores.flatMap(temp =>
-        Array(threadsPerCore).fill(temp)
-      );
+      temps = siTemps.cores.flatMap(temp => Array(threadsPerCore).fill(temp));
+      mainTemp = siTemps.main; // AVG temp of all cores, in case no per-core data is found
     }
 
     return loads.map(({ load }, i) => ({
       load,
-      temp: temps[i],
+      temp: temps[i] ?? mainTemp,
       core: i,
     }));
   }